Nonlocal Polarization Effects in Vibronic Spectra

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Abstract
The modified point-charge model of electron-lattice coupling in ionic crystals is extended to include nonlocal polarization effects. The extension is carried out within the framework of the shell models for the lattice dynamics of pure ionic lattices. For those vibronic spectra, associated with weakly localized electron-lattice coupling (type I), the shell coordinates may be eliminated by means of an adiabatic approximation. Because of the peculiarities of the Green's-function formalism, however, the double space of nuclear and shell coordinates has to be employed to the end for vibronic spectra associated with strongly localized electron-lattice coupling (type II).